Well my figures dont have any difference at all... both have Four ridges or horizontal lines in each of their inner air intake thingie. Although I must admit at first glance Skywarp tends to be looking more sleek than Screamer, but then that I can certainly be sure is beacuase of the color scheme Skywarp has been given. Screamer looks a little fat coz of the lighter color scheme it has. But as far as I can see in my figs.... no difference at all.
Wanted AM partner Vanguard, Myclones Dirge, G1 Victory Leo, e-hobby Dark scream ( the black version), e-hobby Magnificus
Parts- AM partner Basher-side guns, G1 Actionmaster Elite Windmill's blades[I][B]